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| 87201431 | Feb 1988 | CN |
| 2103938 | May 1992 | CN |
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| 2137107 | Jun 1993 | CN |
| 2179041 | Oct 1994 | CN |
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| 599760 | Mar 1948 | GB |
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| Entry |
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| Office Action Issued Oct. 18, 2010 in U.S. Appl. No. 12/544,256. |
| U.S. Appl. No. 13/570,472 by Akkad, filed Aug. 9, 2012. |